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To me, this project seems much more useful than these platform specific apps. ANY screen with a browser means much more compatibility than iPad only for the second screen.

Sidecar is only possible if your Mac and iPad are fairly new models. Also, it doesn't allow one to use e.g. another MacBook or iMac as a screen.

I use YAM display[1] with a 2012 macbook and an ipad mini from 2015, which works great!

I don't think you can use another mac as a second screen though.

[1]: https://www.yamdisplay.com/

Also check out Luna Display if you want to use another Mac as a display: https://astropad.com/product/lunadisplay/

What about my Mac and my Android tablet?